Rotary harrow



(No Model.) 2 Sheets-Sheet 1.

L. N. PETERSEN, M. L. HARKSEN & H. HAGGE.

ROTARY HAREOW.

No. 326,775. Patented ept. 22, 1886.

(No Model.) I 2 Sheets-Sheet 2.

L. N. PETERSEN, M. E. HARKSEN & H. HAGGE. ROTARY HAREOW.

No. 326,775. Patented Sept. 22, 1885.

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UNITED STATES ATENT rErcE.

LoUIs N. PETERSEN, MARTIN LUDWIG HARKSEN, AND HENRY HAGGE, OF BRYANT, IOWA.

ROTARY NARROW.

SPECIFICATION forming part of Letters Patent No. 326,775, dated September 22, 1885.

Application filed June 1, 1885. (No model.)

T all whmn it may concern.-

Be it known that we, LoUIs N. PETERSEN, ll/IARTIN L. HARKSEN, and HENRY HAGGE, citizens of the United States, residing at Bryant, in the county of Clinton and State of Iowa, have invented certain new and useful Improvements in Harrows; and we hereby declare the following to be a full, clear, and exact description of the same.

[0 Our invention relates particularly to rotary harrows which are caused to rotate when dragged over ground, which it is designed to prepare by leveling or stirring the soil, destroying weeds, or covering seed by means of a weight, which weight in some cases is capable of being shifted to cause the rotation to occur in a desired direction, and is secured eccentrically upon the device, whereby the teeth of the harrow on the same side with the 2 weight are caused to sink into the ground to a depth proportionate to the weight, thus affording the resistance as the machine is drawn along which produces desired rotation. It is not, however, always wished to occasion this 2 5 rotary movement of the harrow, particularly where the soil does not require vigorous treatment to render it properly fit for a desired purpose; or, owing to its condition, the teeth of the harrow may sink into it to a sufficient o depth without theimposition of a great weight, in either of which cases a fixed weight suitable for soil of a nature considerably refractory, possesses a disadvantage, inasmuch as it subjects the animals employed in dragging the device to unnecessary exertion. It is our object to avoid this disadvantage, and also to decrease the strain upon the animals in pull ingby shorteningthe pull; andit is further our object to afford means whereby the draft-beam 0 may be readily adjusted to cause the teeth of the harrow to run deep or shallow, and to afford a device which shallthoroughly granulate all soil within the area over which it moves.

Our invention consists in the construction whereby the foregoing objects are accomplished; and our invention further consists in certain details of construction and combinations of parts, all as hereinafter particularly set forth.

Referring to the drawings, Figure 1 is a plan view of our improved device; and Fig. 2,a perspective view of the rear section, showing the construction of the bracket.

A A are the forward sections of the harrow, 5 5 both being preferably of the same size and shape, and comprising each a square frame formed of bars t, preferably of iron, provided with diagonal cross-pieces 8, through which and the bars t the teeth 1' of usual or any de- 6c sired form are inserted.

A is the rear section, in form like the sec tions A, but somewhat larger than these, and also having cross-pieces s and teeth r, some of which, as in the sections A, rivet the crosspieces to the frame, and connected with the forward sections, whereby the latter are connected together, all in'the manner hereinafter described. Each section is provided at its center on its upper side with a vertical arbor, B, provided with a shoulder, q, (Shown In Fig. 2.)

O G are brackets upon the sections comprising each an arm, 1), and downwardlycurvcd brace p projecting at a right angle from its rear extremity, an arm, 0, welded on its upper sides to the lower extremity of the brace 12. The arm 0 of the bracket on the section has a hook, n, at its extremity to provide a draw-bar, but the arms on the forward sections are screw threaded. A brace, 1), curves upward from the rear extremity of the arm 0, and is welded at its upper extremity on the bracket of theforward sections to thelower s irface of the arm 1), and an arm, Z, on each, extends from the bracket on a level with the arm 0, and, on the rear bracket, two arms, Z. These arms and braces thus all meet at a vertex through which openings are provided in line with each other, which permit a bracket to be slipped upon an arbor, B, on which it is supported by the shoulder q, and secured from removal by a nut, m. It will thus be seen,

from the foregoing, that the arm 19 is higher than the arms 0, Z, and Z, since it extends 9 5 from the upper extremity of the bracket,while the latter extend from the lower extremity of the same.

D is a triangular rigid frame forming the connecting medium of the sections A A and A, by being bolted atits rear angle to the arms Z of the bracketO on the section A, and at its forward angles to the arms Z of the brackets O on the forward sections, A, the hooked arm of the bracket on the rear section being connected with a link, 7c, adjustably secured upon the base of the triangle at the center thereof. Upon the arm 17 of each bracket 0 a weight, E, having an opening formed longitudinally through its center, is detachably adjusted, and is provided with a thumb-nut, 'i,which enables it to be secured in an adjusted position. The screw-threaded ends of the arms 0 of the brackets on the forward sections of the harrow are passed th rough the draft-beam F, as shown, which is provided, in line with its center, with a ring, h, connected with the draft-beam, and to which the animal is hitched, and nuts 00 are provided upon the screw-threads of the arms 0,by

- turning of which the draft-beam may be moved backward toward or forward from the centers of the forward sections, A,whereby they may be caused to run deep or shallow. The draft, as will be seen, is exerted upon the brackets O, which are thus stationary, while the weights E will cause the sections to revolve, the resistance whereby the revolution is produced being gaged by the adjustment of the weights toward or from the centers of the sections; and, if it is not desired to have the latter revolve, the weights E may be entirely V removed.

-be used,) inasmuch as the area traversed in the rotation by the line of its diagonal section .is greater than that traversed by a circular one having a diameter equal to that of the square.

What I claim as new, and desire to secure by Letters Patent, is

:1. A rotary harrow, comprising, in combination, two forward sections, A, provided with vertical arbors B, brackets'O, supported on thGEQLIbOIS B and provided with arms 19 for carrying adjustable weights, and with arms 0, screw-threaded toward their extremities to pass through the draft-beam F, adj ustable thereon by means substantially as described, a section, A, provided with a vertical arbor, B, a bracket, 0, supported uponv the said arbor B, and provided with an arm,

scribed, connecting the bracket 0 on the section A with the brackets O on the forward sections, A, whereby the rear section is maintained centrally behind the forward sections, the whole being constructed and arranged to operate as and for the purpose set forth.

2. A rotary harrow, comprising, in combination, two forward sections, A, provided with vertical arbors B, brackets 0, supported on the arbors B and provided with arms 1), carrying adjustable weights E, and with arms 0, screw-threaded toward their extremities, a draft-beam, F, adjustable on the screw-threaded portions of the said arms 0 by means of nuts .29, a section, A, provided with a vertical arbor, B, a bracket, 0, supported on the said arbor B and provided with an arm, 10, carrying an adjustable Weight, E, and with a hooked arm, 0, and a frame, D, connecting the brackets G on the forward sections, A, with the bracket 0 on the rear sections, A, the whole being constructed and'arranged to operate substantially as described.

3. A rotary harrow, comprising, in combi-.

nation, two forward square sections, A, provided with vertical arbors B, brackets C, supported on the arbors B and provided with arms 10 and Z, weights E, detachable from and adjustable on the said arms '10, arms 0 on the said brackets 'O, screw-threaded toward their extremities, a draft-beam, F, adjustable on the screw-threaded portions of the said arms 0 by means of nuts 00, a square section, A, larger than a section, A, and provided with a vertical arbor, B, a bracket, 0, supported on the said arbor B, and provided with armsp and l, a weight, E, detachable from and adjustable on the said arm 10, a hooked arm, 0, extend- IOO ing from the said bracket, and a triangular frame, D, connecting together the arms Z and Z of the brackets on the sections A and A, and carrying an adjustable link, is, to-engage with the hooked end of the arm 0 of the bracket on the rear section, A, the whole being constructed and arranged to operate substantially as described.

LOUIS N. PETERSEN. I MARTIN LUDWIG HARKSEN. HENRY HAGGE. In presence of- EMIL N. NAGEL, FRED N. NAGEL. 

